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/*
* Copyright 2014 The Kythe Authors. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.devtools.kythe.extractors.java.standalone;
import static com.google.common.collect.ImmutableList.toImmutableList;
import com.google.common.collect.Lists;
import com.google.devtools.kythe.extractors.java.JavaCompilationUnitExtractor;
import com.google.devtools.kythe.extractors.shared.CompilationDescription;
import com.google.devtools.kythe.extractors.shared.EnvironmentUtils;
import com.sun.tools.javac.file.JavacFileManager;
import com.sun.tools.javac.main.Arguments;
import com.sun.tools.javac.main.Option;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.Options;
import java.io.File;
import java.lang.reflect.InvocationTargetException;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.Collection;
import java.util.EnumSet;
import java.util.List;
import javax.tools.JavaFileObject;
import javax.tools.StandardLocation;
/** A class that wraps javac to extract compilation information and write it to an index file. */
public class Javac9Wrapper extends AbstractJavacWrapper {
@Override
protected Collection<CompilationDescription> processCompilation(
String[] arguments, JavaCompilationUnitExtractor javaCompilationUnitExtractor)
throws Exception {
// Use javac's argument parser to get the list of source files
Context context = new Context();
JavacFileManager fileManager = new JavacFileManager(context, true, null);
Arguments args = Arguments.instance(context);
// JDK changed the signature of Arguments.init method, support both
try {
try {
// JDK15+: the signature is
// init(String, Iterable<String> args);
Arguments.class.getMethod("init", String.class, Iterable.class)
.invoke(args, "kythe_javac", (Object) Arrays.asList(arguments));
} catch (NoSuchMethodException nsme) {
// pre-JDK15:
// init(String, String...);
Arguments.class.getMethod("init", String.class,String[].class)
.invoke(args, "kythe_javac", (Object)arguments);
}
} catch (NoSuchMethodException ns2) {
System.err.printf("Cannot locate com.sun.tools.javac.main.Arguments.init method, JDK version %s\n", System.getProperty("java.version"));
System.exit(2);
} catch (InvocationTargetException|IllegalAccessException ex) {
System.err.printf("Cannot call com.sun.tools.javac.main.Arguments.init (JDK version %s):\n%s\n", System.getProperty("java.version"), ex);
System.exit(2);
}
fileManager.handleOptions(args.getDeferredFileManagerOptions());
Options options = Options.instance(context);
List<String> sources =
args.getFileObjects().stream().map(JavaFileObject::getName).collect(toImmutableList());
// Retrieve the list of class paths provided by the -classpath argument.
List<String> classPaths = splitPaths(options.get(Option.CLASS_PATH));
// Retrieve the list of source paths provided by the -sourcepath argument.
List<String> sourcePaths = splitPaths(options.get(Option.SOURCE_PATH));
// Retrieve the list of processor paths provided by the -processorpath argument.
List<String> processorPaths = splitPaths(options.get(Option.PROCESSOR_PATH));
// Retrieve the list of processors provided by the -processor argument.
List<String> processors = splitCSV(options.get(Option.PROCESSOR));
// Retrieve system path (the value of --system=, unless it equals 'none'
String sysd = options.get(Option.SYSTEM);
if (sysd != null && !"none".equals(sysd)) {
javaCompilationUnitExtractor.useSystemDirectory(sysd);
}
EnumSet<Option> claimed =
EnumSet.of(Option.CLASS_PATH, Option.SOURCE_PATH, Option.PROCESSOR_PATH, Option.PROCESSOR);
List<String> completeOptions = new ArrayList<>();
if (options.isSet(Option.RELEASE)) {
// If --release is set, claim it and the associated -source/-target flags.
completeOptions.add(Option.RELEASE.getPrimaryName());
completeOptions.add(options.get(Option.RELEASE));
claimed.add(Option.RELEASE);
claimed.add(Option.SOURCE);
claimed.add(Option.TARGET);
}
// Retrieve all other javac options.
for (Option opt : Option.values()) {
if (!claimed.contains(opt)) {
String value = options.get(opt);
if (value != null) {
if (opt.getPrimaryName().endsWith(":")) {
completeOptions.add(opt.getPrimaryName() + value);
} else {
completeOptions.add(opt.getPrimaryName());
if (!value.equals(opt.getPrimaryName())) {
completeOptions.add(value);
}
}
}
}
}
/* Special processing for -Ax=y options. Arguments.init immediately processes them
* into x=>y pairs that cannot be easily retrieved. This may be an indication that
* we are processing the command line arguments in a wrong way (that is, after parsing
* them we reconstruct the strings and pass them as completeOptions).
*/
for (String arg : arguments) {
if (arg.startsWith("-A")) {
completeOptions.add(arg);
}
}
List<String> bootclasspath = new ArrayList<>();
for (File bcp : fileManager.getLocation(StandardLocation.PLATFORM_CLASS_PATH)) {
bootclasspath.add(bcp.toString());
}
// Get the output directory for this target.
String outputDirectory = options.get(Option.D);
if (outputDirectory == null) {
outputDirectory = ".";
}
int batchSize = readSourcesBatchSize().orElse(sources.size());
List<CompilationDescription> results = new ArrayList<>();
for (List<String> sourceBatch : Lists.partition(sources, batchSize)) {
String analysisTarget =
EnvironmentUtils.readEnvironmentVariable(
"KYTHE_ANALYSIS_TARGET", createTargetFromSourceFiles(sourceBatch));
results.add(
javaCompilationUnitExtractor.extract(
analysisTarget,
sourceBatch,
classPaths,
bootclasspath,
sourcePaths,
processorPaths,
processors,
completeOptions,
outputDirectory));
}
return results;
}
@Override
protected void passThrough(String[] args) throws Exception {
com.sun.tools.javac.Main.main(args);
}
public static void main(String[] args) {
new Javac9Wrapper().process(args);
}
}
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